Let's say you were blowing a balloon and got tired. For some reason you can't take the balloon away from your mouth in time to avoid serious damage. The balloon gives back the all the air you blew inside it exceeding your lung capacity.
well, if you watched the video on the 4th answer, that should prove that the balloon can have greater capacity than your lungs. if the girl got tired there, that could have got her good... its true though that a regular balloon would be weaker than the lungs.

By no means. Your lungs are way stronger. Just watch this: http://www.youtube.com/watch?v=UVU6kOWS-zw&NR=1